Example: You are playing with some people that started WoW after the shattering patch. You are having a good time farming scourgestones for argent dawn rep when one of them goes "hey guys? whats this puddle of blood on the floor?"
Now you know whats going to happen. It happened to all of us back in the day. Question is do you spoil it for them, or warn them to keep things smooth sailing but also stop them getting that same memorable experience we did all those years ago?
Because theres a fair few of those when you think about it. That nice human village outside SFK after the sun goes down, stitches in duskwood, opening the mailboxes in stratholme and so on. Things that can be progress impeders but remain some of the more memorable experiences when not doing things like standing in Westfall screaming if anyones seen the defias messenger in chat.
Would you ruin the surprises for the sake of saving them a bad time? or is that ruining part of the authenticity of the vanilla experience?